Fix maintainers-sync / CODEOWNERS job errors

[igorpecovnik]

Two fixes for the scheduled Data: Sync maintainers job.

1. Job fails: no .wip boards left

sed: can't read config/boards/*.wip: No such file or directory
##[error]Process completed with exit code 2

Now that the last .wip board became .csc, the brace-glob config/boards/*.{conf,wip,csc,eos,tvb} leaves *.wip literal (no nullglob), so sed / grep read a nonexistent path and GitHub's default bash -e -o pipefail aborts. Affects Update maintainers and Mark csc for no maintainer.

Fix: shopt -s nullglob in both steps (empty class → nothing), plus || true on the demote grep so "nothing to demote" (grep exit 1) doesn't trip pipefail.

2. expr: syntax error noise during CODEOWNERS generation

expr: syntax error: unexpected argument '.*\(rk[[:digit:]]\+.*\)_.*'

config/sources/families/include/rockchip64_common.inc had expr $BOOTCONFIG : '...' unquoted. For a board with no BOOTCONFIG, the empty operand vanishes and expr sees : REGEX → syntax error. The || true hid the exit code but not the stderr. Quote it ("${BOOTCONFIG}") so an empty value is a proper empty-string argument.

Verification

• Reproduced the .wip failure with a fixture lacking .wip; after nullglob the reset sed, the per-board loop, and the demote grep all run clean.
• Reproduced the expr error with empty BOOTCONFIG; quoted form yields empty (no error) and still extracts the SoC (rk3588-orangepi-5_defconfig → rk3588-orangepi-5) for a real value.
• YAML + bash -n clean.

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